A polyhedron is any three-dimensional figure with flat surfaces that are polygons.

Specifically, any geometric shape existing in three-dimensions and having flat faces, each existing in two-dimensions, which intersect at straight, linear edges.

Neandertalere var meget kraftige i forhold til nåtidsmennesker.

This definition of a polyhedron is not very precise, and to a modern mathematician is quite unsatisfactory.Dette geografiske navnet går igjen tilbake til en protestantisk kirkemusiker, Joachim Neander (1650–1680), som gjerne gikk tur i området.